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某些突发性工作负载的读取 I/O 延迟更高

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ontap-9
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适用于

  • ONTAP 9
  • AFF 系统

问题描述

  • 系统在 LUN 或卷中遇到更高的读取 I/O 延迟
    • 我们可以在 Grafana 或任何其他用于后端读延迟监控的报告工具中看到这一点。 
  • 在驱动器中特别注意到高读取 I/O 延迟
    • 但它可能指向 Network/Protoco,如 FCP。
  • 延迟峰值高于 15 毫秒,高于预期的正常延迟。示例

::> qos statistics volume latency show -volume <vol_name> -vserver <SVM_name>
Workload    ID    Latency    Network     Cluster    Data      Disk    ...
--------    --    -------    ---------    -------    ---------    -------   ...
-total-     -    17.47ms    1018.00us    0ms       2.04ms   14.41ms  ...
-total-     -    4.43ms    1400.00us    0ms      861.00us    2.17ms  ...
-total-     -    16.98ms    133.00us    0ms       1.93ms    14.92ms   ...
-total-     -    7.49ms    748.00us    0ms      1199.00us    5.54ms   ...
-total-     -    12.77ms    207.00us    0ms      1496.00us    11.06ms   ...
-total-     -    10.02ms    227.00us    0ms       2.03ms    7.76ms   ...
...        

 

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